Elon Musk’s 3-year-old son, X AE A-XII, adorably loses shoe in Cannes

If the shoe fits.

Elon Musk’s 3-year-old son, X AE A-XII, adorably lost one of his sneakers while on an outing with his billionaire father in Cannes.

On Wednesday, the Tesla founder was photographed walking in the South of France ahead of his toddler, who was visibly missing one of his shoes.

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An unidentified woman held onto the little one’s hand as they followed Musk, 52, out of a venue during the Cannes Lions Festival.

The tech guru wore all-black, while his son, whom he shares with ex Grimes, sported a striped short-sleeve shirt, light blue shorts and navy socks.

Musk is dad to 11 children with three different women.

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He and the “Genesis” singer, 36, have been intertwined in a custody battle over X and their other two kids: Exa Dark Sideræl, 2, and Techno Mechanicus, 1.

In addition to sharing twins with Shivon Zilis, Musk has co-parented twins Griffin and Vivian and triplets Kai, Saxon and Damian with ex-wife Justine Wilson since their 2008 split.

The former couple’s first child, son Nevada, died of sudden infant death syndrome, or SIDS, at 10 weeks old in 2002.

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Musk has made headlines in recent months for bringing X along with him on work trips.

In April, X Page Six exclusively reported that X stole the show when he attended the premiere of the new PBS series “A Brief History of the Future.”

An insider told us that the toddler “giggled in the front row and, with uncanny timing, laughed at Seth Meyers’ jokes.”

At an after-party, our spy said Musk “drank one of the night’s themed cocktails and looked very relaxed. He was super friendly to everyone.”

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The source added, “His son played with Ari Wallach’s son. He stayed for a few hours and left before dessert. He definitely had a lot of security — but they gave him space to enjoy the party.”

Last October, the X Corp. owner took X with him to the Formula 1 Grand Prix in Austin, Texas.

X was photographed sitting on his dad’s shoulders and in a Golf cart.